为什么Hibernate的hbm.xml文件无法读取List <String>对象导致java.lang.IllegalArgumentException

问题描述

我正在将一个旧的应用程序从Hibernate 3迁移到5.4.20。我们一直在使用传统的配置文件，希望对旧文件保持相同，以便应用程序继续运行。

这是我的***。hbm.xml文件：

<hibernate-mapping package="com.xyz">
    <class name="Someclass" table="some_table">
        <id name="id" type="java.lang.Long" column="id">
            <generator class="identity" />
        </id>

        <property name="recordId" column="recordId" type="long" not-null="true" />
         <list name="value" table="another_list_table" lazy="false" cascade="all-delete-orphan"  >
            <key column="bean_id" not-null="true"/>
            <list-index column="idx" />
            <element column="list_item" type="java.lang.String" />  
        </list> 
    </class>
</hibernate-mapping>

SomeClass.java

class SomeClass extends SomeExtension<List<String>> {
    private static final long serialVersionUID = 7800887041006403212L;
    public SomeClass() {
    }

    @Override
    public SomeClass clone() throws CloneNotSupportedException {
        SomeClass bean = (SomeClass) super.clone();
        bean.setValue(new ArrayList<>(getValue()));
        return bean;
    }

}

SomeExtension.java

 class SomeExtension<T>  {
    protected T value;
}

尝试运行应用程序时，出现以下异常，

Caused by: java.lang.IllegalArgumentException: Expecting collection type [java.lang.Object]
    at org.hibernate.metamodel.internal.AttributeFactory.determineCollectionType(AttributeFactory.java:936) [hibernate-core-5.4.20.Final.jar:5.4.20.Final]
    at org.hibernate.metamodel.internal.AttributeFactory$PluralAttributeMetadataimpl.<init>(AttributeFactory.java:781) ~[hibernate-core-5.4.20.Final.jar:5.4.20.Final]
    at org.hibernate.metamodel.internal.AttributeFactory$PluralAttributeMetadataimpl.<init>(AttributeFactory.java:762) ~[hibernate-core-5.4.20.Final.jar:5.4.20.Final]
    at org.hibernate.metamodel.internal.AttributeFactory.determineAttributeMetadata(AttributeFactory.java:541) ~[hibernate-core-5.4.20.Final.jar:5.4.20.Final]
    at org.hibernate.metamodel.internal.AttributeFactory.buildAttribute(AttributeFactory.java:90) ~[hibernate-core-5.4.20.Final.jar:5.4.20.Final]
    at org.hibernate.metamodel.internal.MetadataContext.wrapUp(MetadataContext.java:237) ~[hibernate-core-5.4.20.Final.jar:5.4.20.Final]
    at org.hibernate.metamodel.internal.metamodelImpl.initialize(metamodelImpl.java:274) ~[hibernate-core-5.4.20.Final.jar:5.4.20.Final]
    at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:301) ~[hibernate-core-5.4.20.Final.jar:5.4.20.Final]
    at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:469) ~[hibernate-core-5.4.20.Final.jar:5.4.20.Final]
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:708) ~[hibernate-core-5.4.20.Final.jar:5.4.20.Final]
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:724) ~[hibernate-core-5.4.20.Final.jar:5.4.20.Final]
    at com.lowteq.pdms.server.persistence.HibernateUtil.getSessionFactory(HibernateUtil.java:22) ~[main/:na]
    at com.lowteq.pdms.server.persistence.HibernateUtil.openSession(HibernateUtil.java:30) ~[main/:na]
    at com.lowteq.pdms.server.persistence.ServerHibernateAdapter.<init>(ServerHibernateAdapter.java:34) ~[main/:na]
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_211]
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_211]
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_211]
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_211]
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:204) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    ... 45 common frames omitted

有人可以帮我理解为什么List标记无法从SomeClass.java获取列表吗？还是我错过了什么！

解决方法

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hibernate-mapping java java